The Cathedral of Saint Justus the Martyr is named after the city’s patron saint. The first church on the site was built in the 5th century, but in the 14th century the structure was connected to the nearby Church of the Holy Mary by constructing the central hall of the current cathedral, which linked the two existing buildings. Since then, the unified church has received its current name.

The facade features a prominent rose window, beneath which a plaque commemorates the Austro-English bombings against Napoleon’s troops in 1813. Inside, the cathedral consists of five longitudinal halls, adorned with charming Venetian-style frescoes and a mosaic depicting Jesus and the saints in the central hall.

Next to the church are a baptistery and a treasure museum displaying the cathedral’s religious artifacts.